Defeat Hydracubus the same way you did the last two times. Since you are now equipped with the TDS, it should be too easy. After finishing off Hydracubus, you will be transported back to the previous area.

More Shadow Fiends will swarm you but this time Marbus will occasionally toss fireballs at you while you are fighting the fiends. When Marbus starts laughing, he'll toss a fireball at you, so move away! Once all the fiends are dead, you are transported to ANOTHER boss battle against Yotunfrau.

Defeat Yotunfrau the same way you did in the Ice Cavern and it should be easy as pie.

After defeating both bosses, you will be transported back to the previous area to finally face off against Marbus himself.

Marbus likes to hover around the arena. You can block his Fly-by tackle but you have to evade the other attacks. When he flies up high and starts spinning fast, he's going for the Kamikaze Dive. As soon as he torpedoes towards you, use a well-timed Reverse Wind to move out of the way. When he misses, he'll kneel down in pain. Get in close and perform a hard combo on him and then jump back to avoid his retaliation attack.

When he starts launching his fireballs at you, use roll jumps to get out of the way. Also, when he hovers above you and does a loud snarl, he's going for the Kamikaze Punch where he slams down on you with his fist. Use a well-timed Reverse Wind to avoid the punch and then roll in and perform a hard combo.

When he summons the Shadow Fiends, kill them off with Izuna Drops and counterattacks. If you can bait him into getting close to you when there is floating essence, try and do an Ultimate Attack on him. The main strategy here is to bait Marbus into attacking YOU. When you evade his attacks, go and counter at the right moment to reduce his health. Follow the tactics mentioned above and the battle shouldn't be too hard to finish. Once Marbus is dead, grab the DEMON DEITY statue and then hightail it outta there!

SAVE your game and finish whatever it is you need to do. If you need to finish the rest of the Fiend Challenges you missed or restock at Muramasa's Shop, do it now! Once you enter through the doors above the Core, there's no going back!

The Emperor only has two attacks: a melee swipe attack and a Laser Beam attack. Its Laser Beam attack comes in two separate forms: a diagonal beam and a circular beam.

When dodging the beams, hold the Block Button and then move the Analog Stick UP or DOWN to move the floating platform. To dodge the diagonal beams, you must position Ryu (not the platform) BETWEEN the laser paths to avoid getting hit. You can also try jumping down the platform. Ryu won't get hurt and he'll emerge on another platform.

DO NOT waste your Ninpo on this boss! Even though it seems logical to activate Ninpo to avoid getting hit, you're only wasting time! When the boss begins its Circular Laser Beams, simply move all the way BACK and AWAY from the boss. As for its melee attack, just move away!

The boss has three large Orbs on its body: one on each shoulder and one on its chest. You must attack these areas to damage the boss. Dodge its beams and then close in and do some hard combos like the Dragon Tear to shave off lots of health. That's pretty much it. Once the boss is dead, it's time for the next wave!

When the battle begins, equip the Strongbow and start shooting APFSDS Cores or Explosive Arrows at the skulls on the boss's body (shoot from First-Person View). After a couple of direct hits, the boss will start flinging a bunch of skulls at you.

Equip the Flails and begin slicing and dicing (or use fast left and right Reverse Winds). After a couple of flying skulls fly by, the Emperor's head will come after you to chomp on you. Quickly roll away to avoid the attack and then it'll reform.

Use all the Arrows, APFSDS Cores, Explosive Arrows, and Incendiary Shurikens you can to damage the boss while it's walking the lava. When the boss jumps onto dry land, jump towards it and begin attacking its legs using the True Dragon Sword to do some real damage! Keep up the tactic and this boss is toast!